Introducing Google JS Test

For example:

         var myObject = new Something("foo", "bar");	 
	
	 assert("simple operations", function() {
		return myObject.doSomething() == "baz";
	 });;
	 
	 assert("post-operational state", function() {
		return myObject.state() == 123;
	 });;
	 
	 assertAync("async polling", function() {
		return myObject.poll().length > 0;
	 });;

Is the purpose of heavy testing frameworks purely for the useful functions like "deepEquals"? If so, why not make a library with functions like "deepEquals" and use that library with a simple testing framework? Surely, there must be something I'm missing.

Edit: I should note that the beautifully written CoffeeScript compiler/translator doesn't use a testing framework (favoring a few simple hand-rolled functions), and it has a massive suite of tests.

http://i.imgur.com/6jifV.png http://i.imgur.com/cIXox.png

    @GET "/", ( err, response ) =>
      response.withJquery ( err, $ ) =>
        @equal $( "#blah" ).text(), "Something"

Would anybody recommend any other unit-test frameworks for mocking stuff out?